wwest Posted December 13, 2006 Share Posted December 13, 2006 During the recent snow and ice storm here in the Seattle area I noticed that my 2001 AWD RX300, 60,000 miles, was not "acting" quite right. In situations where the VSC/Trac would have normally activated they did not. So I did a couple of "test" runs in an empty parking lot and sure enough the front wheels would spin free with the engine RPM rising accordingly. Also "throwing" it sideways did not result in VSC activation, only the little instrument light (no beeping) on indicating a skid. No real problem as I soon had tire chains on all four. Last week I contacted the service advisor at Lexus of Bellevue who proceeded to advise me, profusely, that the VSC/Trac system will always be operational unless an indicator is lit on the instrument panel indicating otherwise. When I persisted he insisted that it was probably working and I wasn't familier enough with its actions to know. So I fired off an email to firstname.lastname@example.org. In response I was told to contact a dealer. Over the weekend I got out the shop manuals and discovered that the ABS was indicating codes 31,32, and 33, apparently a temporary or intermittent failure of both front wheel speed sensors and one rear wheel sensor, and VSC was indicating a code of 43, ABS control failure. According to the manual the ABS will continue to work with these codes but it was unclear, undefined, as to what the result would be with the VSC code 43. So I contacted Lexus of Seattle and after a long discussion I was told that a VSC code 43 would result in the VSC/Trac system being non-functional but that there should have been a VSC failure indication on the instrument panel. The Lexus Lexus technician suggested that I might have inadvertently ignored the failure indication for enough drive cycles that it would have extinguished. I'm quite sure, VERY sure, there was never an indication of VSC or Trac failure on my instrument panel for multiple drive cycles. When I suggested that the firmware might be flawed in that no indication was displayed the technician allowed that the 2001 was the first year of VSC/Trac implementation on the RX series but refused to speculate further. He did tell me that the wheel speed sensor faults could result from ordinary wheelspin that occurs in low traction conditions. So I have cleared the fault codes but have not yet been able to test the VSC/trac system for operational capability. Quote Link to comment Share on other sites More sharing options...
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